Rating used to describe how bad you have to shit. Best used during long trips:

Defacon 6: Normal shitting procedures. You have no worry about public restrooms.

Defacon 5: Normal shitting procedures. You could probably shit if upon request, like a monkey. Should be able to surpass pooformance anxiety.

Defacon 4: Something's up. Somehow, someway, you know somethings going to go wrong today. It might be the big one, it might not. Either way, you're going to drop the kids off at the pool sometime in the next 24 hours.